Java 内存错误:无法创建新的本机线程 [英] Java Memory error: unable to create new native thread

问题描述

运行 java 服务器时，我在 UNIX 服务器上收到此错误:

I get this error on my UNIX server, when running my java server:

Exception in thread "Thread-0" java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:640)
at [... where ever I launch a new Thread ...]

每次运行大约 600 个线程时都会发生这种情况.

It happens everytime I have about 600 threads running.

我已经在服务器上设置了这个变量:

I have set up this variable on the server:

$> ulimit -s 128

我觉得奇怪的是这个命令的结果，我在上次出现错误时运行了这个命令:

What looks strange to me is the result of this command, which I ran when the bug occured the last time:

$> free -m
              total       used       free     shared    buffers     cached
Mem:          2048        338       1709          0          0          0
-/+ buffers/cache:        338       1709
Swap:            0          0          0

我像这样启动我的 java 服务器:

I launch my java server like this:

$> /usr/bin/java -server -Xss128k -Xmx500m -jar /path/to/myJar.jar

我的 debian 版本:

My debian version:

$> cat /etc/debian_version
5.0.8

我的java版本:

$> java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

我的问题:我在互联网上读到我的程序应该处理大约 5000 个线程.那么这是怎么回事，请问如何解决?

这是我打开 shell 时 ulimit -a 的输出:

this is the output of ulimit -a when I open a shell:

core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 794624
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 100000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 794624
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

我将脚本作为来自 init.d 的守护进程运行，这就是我运行的:

I run the script as a daemon from init.d, and this is what i run:

DAEMON=/usr/bin/java
DAEMON_ARGS="-server -Xss128k -Xmx1024m -jar /path/to/myJar.jar"
ulimit -s 128 && ulimit -n 10240 && start-stop-daemon -b --start --quiet --chuid $USER -m -p $PIDFILE --exec $DAEMON -- $DAEMON_ARGS 
    || return 2

<小时>

Edit2:我在线程的 java 测试中遇到了这个堆栈溢出问题:how-many-threads-can-a-java-vm-support

    public class DieLikeADog { 
        private static Object s = new Object(); 
        private static int count = 0; 
        public static void main(String[] argv){ 
            for(;;){ 
                new Thread(new Runnable(){ 
                        public void run(){ 
                            synchronized(s){ 
                                count += 1; 
                                System.err.println("New thread #"+count); 
                            } 
                            for(;;){ 
                                try { 
                                    Thread.sleep(100); 
                                } catch (Exception e){ 
                                    System.err.println(e); 
                                } 
                            } 
                        } 
                    }).start(); 
            } 
        } 
    } 

在我的服务器上，程序在 613 个线程后崩溃.现在我确定这不正常，仅与我的服务器配置有关.有人可以帮忙吗?

On my server, the program crashes after 613 threads. Now i'm certain this is not normal, and only related to my server configuration. Can anyone help please ?

编辑 3:我遇到过这篇文章和许多其他文章，解释说 linux 可以'不要创建 1000 个线程，但你们告诉我，你可以在你的系统上做到这一点.我不明白.

Edit 3: I have come across this article, and many others, explaining that linux can't create 1000 threads, but you guys are telling me that you can do it on your systems. I don't understand.

我也在我的服务器上运行了这个脚本:threads_limits.c 限制在 620 个线程左右.

I have also ran this script on my server: threads_limits.c and the limit is around 620 threads.

我的网站现在离线，这是我的项目可能发生的最糟糕的事情.我不知道如何重新编译 glibc 和这些东西.工作量太大了.

My website is now offline and this is the worst thing that could have happened to my project. I don't know how to recompile glibc and this stuff. It's too much work imo.

我想我应该切换到 Windows 服务器.因为此页面上建议的设置都没有进行任何更改:我的系统上的限制是 600 到 620 个线程，无论涉及的程序是什么.

I guess I should switch to windows server. Because none of the settings proposed on this page did make any change: The limit on my system is between 600 and 620 threads, no matter the program involved.

推荐答案

刚得到以下信息: 这是我的主机提供商施加的限制.这与编程或linux无关.

Just got the following information: This is a limitation imposed by my host provider. This has nothing to do with programming, or linux.

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